This takes a map (possibly empty), generates a record from it, converts that to a Mesos protobuf object with the appropriate default values, and then returns a nested Clojure map with all those values. At that point, the data would be ready for conversion to another format (such as JSON).

Documentation forthcoming

Given a type’s record name (as a keyword) and a map for the type’s data, return a nested JSON string containing the passed data and any default values provided by Mesos.